Can Blender still be used commercially since Java licensing has changed?
Blender is made with Python and C/C++, not Java. Also Blender is free and open source software that can be used commercially in any condition.
In completement a link to Blender's licence page.

Blender is released under the GNU General Public License (GPL, or
“free software”).
This license grants people a number of freedoms:
You are free to use Blender, for any purpose
You are free to distribute Blender
You can study how Blender works and change it
You can distribute changed versions of Blender

The GPL strictly aims at protecting these freedoms, requiring everyone
to share their modifications when they also share the software in
public. That aspect is commonly referred to as Copyleft.
The Blender Foundation and its projects on blender.org are committed
to preserving Blender as free software.